2-7
Step 2: Offset Calibration
1. Press ENTER. The instrument will display the follow-
ing prompt.
CONNECT TRIAX SHORT
ENTER to continue; EXIT to abort
2. Connect the shorted triax cable (connect red and black
clips together) to the instrument INPUT jack.
3. Press ENTER. The instrument will then begin voltage
offset calibration. While calibration is in progress, the
following will be displayed:
Performing V offset calibration
4. When the voltage offset calibration step is completed,
the following message will be displayed:
CONNECT TRIAX CAP
ENTER to continue, EXIT to abort
5. Disconnect the triax short from the INPUT jack, and
connect the triax shielding (non-shorting) cap to the
INPUT jack in its place.
6. Press ENTER to begin the bias current calibration step.
During this step, the instrument will display:
Performing I Bias calibration
Figure 2-1
Calibration unit connections
WARNING:
NO INTERNAL OPERATOR SERVICABLE PARTS,SERVICE BY QUALIFIED PERSONNEL ONLY.
WARNING:
NO INTERNAL OPERATOR SERVICABLE PARTS,SERVICE BY QUALIFIED PERSONNEL ONLY.
CAUTION:
FOR CONTINUED PROTECTION AGAINST FIRE HAZARD,REPLACE FUSE WITH SAME TYPE AND RATING.
CAUTION:
FOR CONTINUED PROTECTION AGAINST FIRE HAZARD,REPLACE FUSE WITH SAME TYPE AND RATING.
INPUT
250V PEAK
!
LINE RATING
50-60HZ
50VA MAX
AC ONLY
LINE FUSE
SLOWBLOW
1/2A 90-125V
1/4A 180-250V
IEEE-488
(CHANGE IEEE ADDRESS
WITH FRONT PANEL MENU)
DIGITAL
I/O
TRIG LINK
115V
LO
HI
RS232
!
MADE
IN
U.S.A.
PREAMP OUT
250 PEAK
COMMON
2V ANALOG
OUTPUT
TEMP
TYPE K
HUMIDITY
OPTION SLOT
V SOURCE
EXT TRIG
IN
MTR COMP
OUT
INTERLOCK
SELECTED
LINE VOLTAGE
90-110V
105-125V
180-220V
210-250V
1010V
PEAK
750V
PEAK
Digital Cable (Supplied with 5156)
Model 6517 Electrometer
Digital I/O
Connector
Caution: Do not connect any equipment
except Model 5156 Calibration
Standard to Model 6517 DIGITAL I/O
port during calibration.
100G
Ω
1nF
100nF
10G
Ω
1G
Ω
100M
Ω
Model 5156 Electrometer Calibration Standard
OUTPUT
!
Step 3: Volts Calibration
1. Remove the triax shielding cap from the INPUT jack,
and connect the DC voltage calibrator to the INPUT
jack in its place, as shown in Figure 2-2. Note that these
connections are made using a low-noise coax cable, a
triax-to-BNC adapter, and a BNC-to-dual banana plug
adapter.
2. Following the zero check calibration step, the instru-
ment will prompt you to connect 0V DC:
CONNECT 0 V
ENTER to continue; EXIT to abort
3. Set the DC voltage calibrator output to 0.00000V DC,
and allow a short time period for settling.
4. Press ENTER to continue. During 0V DC calibration,
the Model 6517A will display the following:
Performing 0V calibration
5. Next, the unit will prompt for a 1.9V DC input:
CONNECT 2.000000 V
ENTER to continue; EXIT to abort